Dear PrajktaPatil,
Thanks for participating in the Microsoft Community. I'm an Independent Advisor and I'll help you.
Do you have Onedrive to sync your files?
Upload center could have a conflict with Onedrive client or the file what you says, maybe has a limitation. Verify if the file has a system characters or a long path.
Also, try to delete Office cache:
In Windows 8 or 8.1, point to the lower-right corner of the screen, click Search, then type Microsoft Upload Center in the Search box, and then double-click the Microsoft Upload Center app in the search results (it may say 2010 or 2013, depending on your Office version).
Then, in the Upload Center, click Settings, and then click Delete Cached Files.
Do not hesitate to ask if you need more information.
I hope it has been useful to you.
Regards,
Renzo.
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